Features: 【High-quality Material】: Our car backup alarm made of ABS material, which makes it light weight, sturdy and durable. It has good wear resistance, has a long service life. 【Sound Output】: Active piezo electronic buzzer module support 220V AC power supply, the buzzer will ring when powered on. The active buzzer can continuously work for up to 12 hours. 【High Sound Level】: 110dB sound output, single alarm sound high decibel active buzzer will meet your requirement.greatly improving safety and reliability. 【Easy Installation】: The buzzer horn is very easy to install, without taking up a lot of your time, very convenient, can effectively save you energy and time. Red wire is positive pole, black wire is negative pole. 【Wide Application】: The active buzzer can be used in fire disaster alarm, if you have any problem with this item, please feel free to contact us. We are happy to solve the problem for you. 24/7 email support. Specification: Item Type: Active Buzzer Operating Voltage: AC 220V Decibel: 110dB Wire Length: Approx. 33cm / 13.0in Package List: 1 x Buzzer 【High-quality Material】: Our car backup alarm made of ABS material, which makes it light weight, sturdy and durable. It has good wear resistance, has a long service life. 【Sound Output】: Active piezo electronic buzzer module support 220V AC power supply, the buzzer will ring when powered on. The active buzzer can continuously work for up to 12 hours. 【High Sound Level】: 110dB sound output, single alarm sound high decibel active buzzer will meet your requirement.greatly improving safety and reliability. 【Easy Installation】: The buzzer horn is very easy to install, without taking up a lot of your time, very convenient, can effectively save you energy and time. Red wire is positive pole, black wire is negative pole. 【Wide Application】: The active buzzer can be used in fire disaster alarm, if you have any problem with this item, please feel free to contact us. We are happy to solve the problem for you. 24/7 email support.